The excerpt below is taken from Tom Gibney's handbook file (VMS_EPICS.MEM).
1) For this VMS implementation the Channel Access server list is hard-coded into the C shareable library. For unix and Windows an environmental variable specifies the list. The only server included in this list at this time is the NSTX EPICS gateway.
2) The EPICS PV names are case-sensitive.
3) The C-interface uses ezca, for which documentation can be found here. Note that I don't know of anyone at PPPL who has actually written a VMC C program that call the ezca library.
The shared library which contains the EPICS functions is
SYS$SHARE:CAUTILSHR.EXE
This shared library provides C-language functions which can
be called by user-written code. Among these functions are:
ezcaGet
ezcaGetIEEE
Calling "ezcaGet" is described in the EPICS documentation. It returns
floating point values in the default VMS formats.
"ezcaGetIEEE" is just the same as "ezcaGet", but it returns floating
point values in IEEE format, as required by IDL.
=============================================
Building CAUTILSHR:
Refer to: NSTX$:[EPICS.EPICS_VMS_SOURCE]README.MEM
Source code is in NSTX$:[EPICS.EPICS_VMS_SOURCE...].
! 25-Jan-05 PR/PS The CA server address is hard-coded into the C
! shareable library:
KEES$ sea NSTX$:[EPICS.EPICS_VMS_SOURCE.CHANNEL_ACCESS]envdata.c epics_ca_addr
epicsShareDef READONLY ENV_PARAM EPICS_CA_ADDR_LIST = { "EPICS_CA_ADDR_LIST", "1
98.35.15.132" };
&EPICS_CA_ADDR_LIST,
Page edited 28JAN2005 by Paul Sichta [psichta@pppl.gov]